How do we find the number of protons in an atom???..Specially in an atom of an element??

Question

How do we find the number of protons in an atom???..Specially in an atom of an element??

Answer 1

The number of protons in an atom is written on the periodic table and it is called atomic number.

For example Carbon has 12 protons, Hydrogen only 1 and Radium  88

The mass number instead is the number of protons + the number of neutrons found in the nucleus of an isotope.

Answer 2

The number of protons is the element number.

For example, H is the first element, so it has one proton.  The number of protons a compound has uniquelly defines an element.

Answer 3

the atomic number is the number of both protons and neutrons that an element has.